HChem midterm study guide_ answers
1.a.9.36 X 106b.7.728 x 10-1c.3.7001 x 10-5d.1.9 x 1011
2.a.820011.12b.0.000323876c.10.9857d.0.0563
3.a.1b.1c.3d.4e.1f.2g.5h.3
4.a.3.41 cmb.3460c.2.010d.0.8535e.49670f.0.003
5.a.7.36 x 107b.3.57 x 10-3c.8.65 x 10-1d.2.10 x 102e.7.24 x 105
6.a.5.2b.14.0c.3190 or 3.19 x 103d.3.74
e.3540.2f.-4328908g.7 x 10-5
7.a.7.5 x 103 mLb.2.633123 x 108 mL/week
c.1.65 x 10-4qtsd.4.0710263
e.14.53 m/secf.5.25 x 109 mg
g.244.955 lbsh.8.5 x 10-2 mi
i.0.62 ftj.2.2 x 10-4 mi
k.9.7 x 106 secl.4.9 x 104 mm
m.5.72 x 10-3 kgn.0.2756 L
8.Convert to Celsius:a. 350 K = 77 oCb.17 K = -256 oCc.212 K = -60 oC
Convert to Kelvin:a.8.50 oC = 281.5 Kb.191 oC = 464 Kc.-40 oC = 233 K
9.D = M/VUnits= grams/mL or grams/cm3
a.5.35 cm3b.4.74 kg/Lc.0.087 g/cm3d.77.9 ge.74.7 ml
10.a.see glossary for term definitions
b.E, C, M, M, Mc.M, M, P, Pd.He, Ho, Ho, Ho
M, C, E, C,MP, P, P, MHe, He, Ho, He
P, M, M, MHe, Ho, Ho, Ho
11.a.Pb.Cc.Pd.Pe.P
f.Cg.Ph.Pi.P
12.See PT
13.a.Mgb.c. d.e.
14.a.94 p, 150 nb.55 p, 78 nc.89 p, 138 nd.26 p, 31 n
15.a.8 p, 10 e, Z = 8
b.11 p, 10 e, Z = 11
c.cation, the positive charge indicates the ion has lost electrons
d.anion, the negative charge indicates the ion has gained electrons
16.(63)(.6915) + (65)(.3085) = 63.62 u
17.
Element / Symbol / Atomic number / Mass number / Protons / Electrons / Neutrons / Gained/Lost electrons / Family Name / Metal/ nonmetal/metalloid
hydrogen / H / 1 / 1 / 1 / 1 / 0 / 0 / 1a / Nonmetal
helium / He / 2 / 4 / 2 / 2 / 2 / 0 / Noble gases / Nonmetal
chlorine / Cl 1- / 17 / 35 / 17 / 18 / 18 / Gained 1 / Halogens / Nonmetal
carbon / C / 6 / 12 / 6 / 6 / 6 / 0 / 4a / Nonmetal
potassium / K 1+ / 19 / 39 / 19 / 18 / 20 / Lost 1 / Alkali metals / Metal
Zinc / Zn2+ / 30 / 65 / 30 / 28 / 35 / Lost 2 / Transition metals / Metal
Gold / Au3+ / 79 / 197 / 79 / 76 / 118 / Lost 3 / Transition metals / metal
18.a.selenium monoxidei.barium hydroxide
b.diboron trioxidej.potassium acetate
c.arsenic tribromidek.lithium carbonate
d.tin(IV) oxidel.iron(III) sulfate
e.copper(II) sulfidem.hydrobromic acid
f.calcium nitriden.acetic acid
g.ammonium nitriteo.nitrous acid
h.silver nitrate
19.a.Ba3N2i.CaBr2
b.AgIj.Li2SO3
c.SF6k.HNO3
d.CCl4l.H2SO3
e.Mg(C2H3O2)2m.Cu(MnO4)2
f.FeSO4n.H3PO4
g.ZnCrO4o.Fe2O3
h.CoCO3
20.a.phosphoric acidl.sodium acetate
b.cesium hydroxidem.sodium sulfite
c.lithium oxiden.carbonic acid
d.calcium hydroxideo.lithium hydride
e.calcium bromidep.carbon monoxide
f.iron(III) oxideq.magnesium bromide
g.sulfuric acidr.tin(II) bromide
h.iron(II) carbonates.dinitrogen monoxide
i.sulfur trioxidet.ammonium fluoride
j.barium carbonateu.hydrogen carbonate ion
k.aluminum hydroxidev.potassium oxide
21.a and breactants products
22.a.Zn(s) + S(s) ZnS(s)
b.2 Na(s) + 2 H2O(l) H2(g) + 2 NaOH(aq)
c.FeCl3(aq) + 3 NaOH(aq) Fe(OH)3(s) + 3 NaCl(aq)
d.3 H2(g) + N2(g) 2 NH3(l)
e.CO2(g) + 2 LiOH(s) + Li2CO3(s) + H2O(l)
f.4 Al(s) + 3 O2(g) 2 Al2O3(s)
g.2 H2S(g) + O2(g) 2 H2O(g) + 2 S(s)
h.3 H2(g) + Fe2O3(s) 3 H2O(l) + 2 Fe(s)
23.a.acid-baseb.decompositionc.synthesisd.decomposition
e.precipitationf.acid-baseg.synthesish.single displacement
24.a.Mg(s) + 2 HNO3(aq) Mg(NO3)2(aq) + H2(g)
b.2 C2H2(g) + 5 O2(g) 4 CO2(g) + 2 H2O(g)
c.no reaction
d.Zn(s) + CuSO4(aq) ZnSO4(aq) + Cu(s)
e.(NH4)2SO4(aq) + Pb(NO3)2(aq) 2 NH4NO3(aq) + PbSO4(s)
f.2 FeCl3(s) 2 Fe(s) + 3 Cl2(g)
g.4 Na(s) + O2(g) 2 Na2O(s)
h.2 C2H6(g) + 7 O2(g) 4 CO2(g) + 6 H2O(g)
i.Na2CO3(aq) + 2 KCl(aq) 2 NaCl(aq) + K2CO3(aq) no reaction
j.C3H8(g) + 5 O2(g) 3 CO2(g) + 4 H2O(g)
k.2 Al(s) + 3 H2SO4(aq) Al2(SO4)3(aq) + 3 H2(g)
l.BaCl2(aq) + Na2SO4(aq) BaSO4(s) + 2 NaCl(aq)
25.a.Ag is oxidized0 +1
S is reduced0 -2
b.Al is oxidized0 +3
Cu is reduced+2 0
c.This is not a redox reaction. Nothing is oxidized or reduced. (It is a precipitation/double displacement reaction.)
d.I is oxidized-1 0
F is reduced0 -1
26.4.24 grams C6H65.43x 10-2 mol3.28 x 1022 molecules
4.04 grams0.244 mol water1.35 x 1023 molecules
1.98 grams4.50 x 10-2 mol2.71 x 1022 molecules CO2
0.297 grams HNO34.71 x 10-3 mol2.84 x 1021 molecules
45.94 grams1.26 mol HCl7.59 x 1023 molecules
9.95 x 102 grams6.99 mol4.21 x 1024 molecules Mg(C2H3O2)2
1478 grams (NH4)2CO31.538 x 10-2 mol9.262 x 1021 molecules
3.457 x 105 grams1.400 x 103 mol Be(MnO4)28.431 x 1026 molecules
86.93 grams1.657 mol9.97654 x 1023 molecules HClO
27. C = 53.82%, H = 6.453%, N = 8.970%, S = 10.27%, O = 20.49%